Which of the following is a characteristic of natural fibers?

Natural fibers are derived from plants and animals, which is their defining characteristic. These fibers come from various sources: for example, cotton comes from the cotton plant, while wool is sourced from sheep. This biological origin distinguishes natural fibers from synthetic fibers, which are man-made and created through chemical processes.

The other options present characteristics that do not accurately describe natural fibers. While natural fibers can be durable, they are not always more durable than synthetic fibers, as some synthetic materials are specifically engineered for strength and durability. Natural fibers also do not universally exhibit colorfastness, as many can fade or bleed when exposed to water or light. Finally, maintenance requirements can vary widely among natural fibers; some may need special care to maintain their appearance and longevity. Therefore, the correct identification of natural fibers is based on their origin from natural sources, making option B the most accurate choice.